First off, the noise this car makes is incredible. My friends say it sounds like a racecar and I agree! I feel ALOT more power throughout the power band, alot more torquier, quicker and pulls harder than ever. It still isn't as loud as I want it to be but I'm cool with staying at this volume for now lol. It smells like its supposed to smell, like a cat delete. I get a strong stench of it every time I come to a stop but it doesnt bother me.

Anyway, I put about 100 miles on my car with the pipes, and I have no check engine light. Does this mean that I do not need a tune or an 02 sensor to take care of it? Or is it going to come on later in time.

If you drive it easy/freeway driving you'll trigger the light faster.

It's a matter of time. It will either happen when you start in the morning or as you're cruising along.